The Hoya 49mm 85C Daylight to Tungsten Conversion Glass Filter is a high-quality filter designed for photographers looking to correct the color balance when shooting under tungsten lighting conditions. This filter is part of the Hoya SFX Filters line and is manufactured by the reputable brand Hoya. The 85C filter effectively converts daylight to a warmer tungsten light, allowing for more accurate and natural-looking colors in your images. With a diameter of 49mm, this filter is compatible with a wide range of lenses and is an essential tool for photographers who frequently shoot in mixed lighting environments.